The Gem System in SF x Tekken is a mode where you can mix a total of 4 or 5 gems to create a combination of abilities. These abilities correspond to the gems that are in your disposal. For example, the speed gems allow you to speed up the flow of the fight, only on your part, however. Take For example, the following video:
Do you see the difference? You see how Zangief was able to grapple Kazuya in a speedy manner, while a normal player won’t be able to grapple you the same way. The speed difference is evident.
In another example, the beginner Gem player won’t even notice the Gem system is in play, rather, he uses his moves to his advantage. In the next video, a novice player will attempt to use his gems in order to win a match, this is the result:
The expert player, the Intermediate player will use every ounce of the Gem system to overthrow his opponent. See for yourself:
You see? The player controlling Ryu knows exactly what the Gems do, otherwise he wouldn’t be able to use his combos as if it were under his control. He switched characters to help his fighting style along.
The Gem System includes parts of the Pandora system. What it does is that it allows you to power up, but with a risk; your life. See for yourself:
As you can see, the power up is risky, but also powerful. It turns you into an evil version of the character, it makes Akuma look pale in comparison. These power-ups make combos even more deadlier than normal combos. Interested?